Lure

Head down to the far southern tip of Algonquin, where you will find Francis hanging out at the fountain near Castle Tunnel. He's upset, because you only killed one guy instead of taking out the entire organization, even though he specifically asked you to kill only one guy. Regardless of how it makes no sense, he asks you to do one last favor, and even though he insults Niko endlessly in the conversation, Niko agrees to take him up on the offer. After all, money is money.

Your first order of business is to retrieve a sniper rifle Francis left for you to use in a car. The car is located in between Albany Avenue and Union Drive East on the east side of Algonquin. Jump in any car and the GPS will take you there, so no worries about locating it. The car is parked in a small lot in between those two roads, so keep an eye on the HUD for the turquoise dot. The car will be marked with an arrow on as well, so you can see which car you have to boost.

When you locate the vehicle, hotwire it and head to the next destination, which is at the far north end of Algonquin, on Denver Avenue. Again, the GPS will get you there easily enough. Once you arrive, drive into the arrow outside of the guy's building, and Niko will call Francis. Francis will tell you to head to the roof across the street in order to get a clear shot at the guy through his window. This is a good idea, obviously, so get out of the car and do just that.

The building you have to infiltrate is across the street from where you parked your car, and is marked on the map by a yellow dot. Go into the apartment building, and begin climbing up to the very top floor. No one in the building will give you a hard time, even if you're wielding a weapon, so as long as you keep quiet and keep walking, getting to the roof should be a cinch. Once up there, head to the yellow dot on the HUD to begin the final part of this brief mission.

A cutscene will show your target sitting on the couch, watching television. The TV is actually the key to this whole mission. Why? Well, you'll see that the guy is sitting on the couch against a wall, and you can't shoot him through the window from there. However, if you shoot the TV, something might happen. Go ahead and shoot the television set. Your target will then get off the couch and stupidly look outside (how idiotic is this guy?). This gives you a three second (or so) window to shoot him, so once you shoot the TV, quickly get ready to aim at this guy's head or chest, and as soon as you can, pull the trigger. If done properly, the guy will die immediately. Alternatively you can call his phone (you see the number briefly in the cutscene). The number is 545-555-0122, he will get up to answer the phone which gives you time to line up your shot and take him out.

With your target downed, all you now have to do is head back to the ground level and back outside. Even with the loud bang of a sniper rifle, no police should be alerted to what you did as long as you didn't mess with anyone else with the sniper rifle (or start any trouble en route to the building and up to the roof). Once you're outside, Niko will then call up Francis, letting him know that the assassination went off without a hitch. That should get that crooked cop out of your hair for a while.